| Election Name: | 2020 Illinois Republican presidential primary |
| Country: | Illinois |
| Type: | primary |
| Ongoing: | No |
| Previous Election: | 2016 Illinois Republican presidential primary |
| Previous Year: | 2016 |
| Next Year: | 2024 |
| Election Date: | March 17, 2020 |
| Outgoing Members: | FL |
| Elected Members: | AS |
| Candidate1: | Donald Trump |
| Color1: | 283681 |
| Home State1: | Florida[1] |
| Popular Vote1: | 520,956 |
| Percentage1: | 95.98% |
| Delegate Count1: | 67 |
| Candidate2: | Rocky De La Fuente |
| Colour2: | ff2a7f |
| Home State2: | California |
| Delegate Count2: | – |
| Popular Vote2: | 21,833 |
| Percentage2: | 4.0% |
The 2020 Illinois Republican presidential primary took place on March 18, 2020, as one of three contests scheduled on that date in the Republican Party presidential primaries for the 2020 presidential election.
Incumbent United States President Donald Trump was challenged by businessman and perennial candidate Rocky De La Fuente of California. Trump won the state in a landslide victory over his opponent, which earned him enough delegates to secure the Republican party's nomination. Rocky De La Fuente's 4% share of the vote was his third-best performance of any state, after Delaware and Connecticut.
| 2020 Illinois Republican presidential primary[2] [3] | ||||
|---|---|---|---|---|
| Candidate | Popular vote | Delegates | ||
| Count | Percentage | |||
| Donald Trump | 520,956 | 96.0% | 67 | |
| Rocky De La Fuente | 21,833 | 4.0% | 0 | |
| Richard Mayers write-in | 11 | 0.0% | 0 | |
| Total: | 542,800 | 100% | 67 | |